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  2. Shortt–Synchronome clock - Wikipedia

    en.wikipedia.org/wiki/Shortt–Synchronome_clock

    On the left is the primary pendulum in its vacuum tank. The Shortt–Synchronome free pendulum clock is a complex precision electromechanical pendulum clock invented in 1921 by British railway engineer William Hamilton Shortt in collaboration with horologist Frank Hope-Jones, [1] and manufactured by the Synchronome Company, Ltd., of London. [2]

  3. Atmos clock - Wikipedia

    en.wikipedia.org/wiki/Atmos_clock

    Jaeger-LeCoultre's Atmos clock on display. Atmos is the brand name of a mechanical torsion pendulum clock manufactured by Jaeger-LeCoultre in Switzerland. The clock gets the energy it needs to run from temperature changes in the environment and does not need to be wound manually. It can run for years without human intervention.

  4. Pendulum clock - Wikipedia

    en.wikipedia.org/wiki/Pendulum_clock

    A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator : It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.

  5. William Hamilton Shortt - Wikipedia

    en.wikipedia.org/wiki/William_Hamilton_Shortt

    William Hamilton Shortt (1881–1971) was a railway engineer and noted horologist, responsible for the design of the Shortt-Synchronome free pendulum clock, a widely used time standard, employed internationally in observatories in the period between the two World Wars.

  6. Electric clock - Wikipedia

    en.wikipedia.org/wiki/Electric_clock

    Zamboni's clock had a vertical needle supported by a pivot and was so energy efficient that it could operate on one battery for over 50 years. In 1840, Alexander Bain, a Scottish clock and instrument maker was the first to invent and patent a clock powered by electric current. His original electric clock patent is dated October 10, 1840.

  7. Pendulum - Wikipedia

    en.wikipedia.org/wiki/Pendulum

    A quality home pendulum clock might have a Q of 10,000 and an accuracy of 10 seconds per month. The most accurate commercially produced pendulum clock was the Shortt-Synchronome free pendulum clock, invented in 1921.

  8. AOL Mail

    mail.aol.com

    AOL Mail is free and helps keep you safe. ... Should you need additional assistance we have experts available around the clock at 800-730-2563.

  9. Riefler escapement - Wikipedia

    en.wikipedia.org/wiki/Riefler_escapement

    So the suspension spring is used for two functions: suspending the pendulum and giving it impulse. The escapement has better performance than the deadbeat because the force from the pallets, with its variability, is applied not to the pendulum but to the bearer. [4] The escapement has no contact with the pendulum below the suspension spring.

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